Decommissioning Trust Funds (Tables)
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6 Months Ended |
Jun. 30, 2026 |
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| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of June 30, 2026 and December 31, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2026 | | 2025 | | | Fair
Value | | Gross
Unrealized
Losses | | Fair
Value | | Gross
Unrealized
Losses | | | (In Millions) | | Less than 12 months | | $1,122 | | | $17 | | | $361 | | | $3 | | | More than 12 months | | 460 | | | 39 | | | 549 | | | 42 | | | Total | | $1,582 | | | $56 | | | $910 | | | $45 | |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of June 30, 2026 and December 31, 2025 were as follows: | | | | | | | | | | | | | 2026 | | 2025 | | (In Millions) | | Less than 1 year | $14 | | | $31 | | | 1 year - 5 years | 736 | | | 649 | | | 5 years - 10 years | 757 | | | 645 | | | 10 years - 15 years | 195 | | | 188 | | | 15 years - 20 years | 326 | | | 218 | | | 20 years+ | 438 | | | 471 | | | Total | $2,466 | | | $2,202 | |
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| Schedule of Realized Gain (Loss) |
The following table summarizes proceeds from the dispositions of available-for-sale debt securities and the related gains and losses from the sales during the three and six months ended June 30, 2026 and 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended | | Six Months Ended | | | 2026 | | 2025 | | 2026 | | 2025 | | | (In Millions) | | Proceeds from disposition of securities | | $209 | | | $227 | | | $368 | | | $489 | | | Realized gains | | $1 | | | $1 | | | $2 | | | $2 | | | Realized losses | | $6 | | | $4 | | | $8 | | | $8 | |
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| Debt Securities, Available-for-Sale |
The available-for-sale debt securities held as of June 30, 2026 and December 31, 2025 are summarized as follows: | | | | | | | | | | | | | | | | | 2026 | | 2025 | | | (In Millions) | | Fair value | | $2,466 | | | $2,202 | | | Unrealized gains | | $13 | | | $28 | | | Unrealized losses | | $56 | | | $45 | |
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| Entergy Arkansas [Member] |
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| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of June 30, 2026 and December 31, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2026 | | 2025 | | | Fair
Value | | Gross
Unrealized
Losses | | Fair
Value | | Gross
Unrealized
Losses | | | (In Millions) | | Less than 12 months | | $310.6 | | | $5.1 | | | $89.1 | | | $0.6 | | | More than 12 months | | 183.8 | | | 15.0 | | | 211.1 | | | 13.6 | | | Total | | $494.4 | | | $20.1 | | | $300.2 | | | $14.2 | |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of June 30, 2026 and December 31, 2025 were as follows: | | | | | | | | | | | | | 2026 | | 2025 | | (In Millions) | | Less than 1 year | $12.3 | | | $27.7 | | | 1 year - 5 years | 195.9 | | | 140.2 | | | 5 years - 10 years | 288.2 | | | 256.8 | | | 10 years - 15 years | 56.1 | | | 69.1 | | | 15 years - 20 years | 97.1 | | | 61.4 | | | 20 years+ | 43.6 | | | 58.8 | | | Total | $693.2 | | | $614.0 | |
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| Schedule of Realized Gain (Loss) |
The following table summarizes proceeds from the dispositions of available-for-sale debt securities and the related gains and losses from the sales during the three and six months ended June 30, 2026 and 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended | | Six Months Ended | | | 2026 | | 2025 | | 2026 | | 2025 | | | (In Millions) | | Proceeds from disposition of securities | | $7.2 | | | $— | | | $11.0 | | | $— | | | Realized gains | | $0.1 | | | $— | | | $0.1 | | | $— | | | | | | | | | | |
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| Debt Securities, Available-for-Sale |
The available-for-sale debt securities held as of June 30, 2026 and December 31, 2025 are summarized as follows: | | | | | | | | | | | | | | | | | 2026 | | 2025 | | | (In Millions) | | Fair value | | $693.2 | | | $614.0 | | | Unrealized gains | | $2.7 | | | $7.5 | | | Unrealized losses | | $20.1 | | | $14.2 | |
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| Entergy Louisiana [Member] |
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| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of June 30, 2026 and December 31, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2026 | | 2025 | | | Fair
Value | | Gross
Unrealized
Losses | | Fair
Value | | Gross
Unrealized
Losses | | | (In Millions) | | Less than 12 months | | $437.4 | | | $5.3 | | | $179.8 | | | $1.6 | | | More than 12 months | | 150.0 | | | 9.1 | | | 196.6 | | | 13.4 | | | Total | | $587.4 | | | $14.4 | | | $376.4 | | | $15.0 | |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of June 30, 2026 and December 31, 2025 were as follows: | | | | | | | | | | | | | 2026 | | 2025 | | (In Millions) | | Less than 1 year | $5.3 | | | $0.9 | | | 1 year - 5 years | 277.1 | | | 259.0 | | | 5 years - 10 years | 297.4 | | | 227.7 | | | 10 years - 15 years | 98.0 | | | 93.6 | | | 15 years - 20 years | 154.4 | | | 110.9 | | | 20 years+ | 260.8 | | | 300.5 | | | Total | $1,093.0 | | | $992.6 | |
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| Schedule of Realized Gain (Loss) |
The following table summarizes proceeds from the dispositions of available-for-sale debt securities and the related gains and losses from the sales during the three and six months ended June 30, 2026 and 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended | | Six Months Ended | | | 2026 | | 2025 | | 2026 | | 2025 | | | (In Millions) | | Proceeds from disposition of securities | | $113.9 | | | $71.5 | | | $189.6 | | | $181.5 | | | Realized gains | | $0.2 | | | $0.1 | | | $0.6 | | | $0.2 | | | Realized losses | | $4.6 | | | $2.4 | | | $6.1 | | | $4.0 | |
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| Debt Securities, Available-for-Sale |
The available-for-sale debt securities held as of June 30, 2026 and December 31, 2025 are summarized as follows: | | | | | | | | | | | | | | | | | 2026 | | 2025 | | | (In Millions) | | Fair value | | $1,093.0 | | | $992.6 | | | Unrealized gains | | $7.6 | | | $13.0 | | | Unrealized losses | | $14.4 | | | $15.0 | |
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| System Energy [Member] |
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| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of June 30, 2026 and December 31, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2026 | | 2025 | | | Fair
Value | | Gross
Unrealized
Losses | | Fair
Value | | Gross
Unrealized
Losses | | (In Millions) | | Less than 12 months | | $374.8 | | | $6.1 | | | $91.9 | | | $1.1 | | | More than 12 months | | 126.0 | | | 15.1 | | | 141.7 | | | 15.1 | | | Total | | $500.8 | | | $21.2 | | | $233.6 | | | $16.2 | |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
The fair value of available-for-sale debt securities, summarized by contractual maturities, as of June 30, 2026 and December 31, 2025 were as follows: | | | | | | | | | | | | | 2026 | | 2025 | | (In Millions) | | Less than 1 year | $8.4 | | | $2.2 | | | 1 year - 5 years | 262.6 | | | 249.8 | | | 5 years - 10 years | 171.4 | | | 160.3 | | | 10 years - 15 years | 40.9 | | | 25.5 | | | 15 years - 20 years | 74.1 | | | 46.2 | | | 20 years+ | 122.2 | | | 111.0 | | | Total | $679.6 | | | $595.0 | |
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| Schedule of Realized Gain (Loss) |
The following table summarizes proceeds from the dispositions of available-for-sale debt securities and the related gains and losses from the sales during the three and six months ended June 30, 2026 and 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended | | Six Months Ended | | | 2026 | | 2025 | | 2026 | | 2025 | | | (In Millions) | | Proceeds from disposition of securities | | $87.7 | | | $155.3 | | | $166.7 | | | $307.6 | | | Realized gains | | $0.3 | | | $0.8 | | | $0.6 | | | $1.3 | | | Realized losses | | $1.4 | | | $1.4 | | | $2.1 | | | $4.0 | |
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| Debt Securities, Available-for-Sale |
The available-for-sale debt securities held as of June 30, 2026 and December 31, 2025 are summarized as follows: | | | | | | | | | | | | | | | | | 2026 | | 2025 | | | (In Millions) | | Fair value | | $679.6 | | | $595.0 | | | Unrealized gains | | $3.0 | | | $7.4 | | | Unrealized losses | | $21.2 | | | $16.2 | |
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